EXTENSIVE CORROSION
The existing unlined concrete sewer line exhibits extensive corrosion above the low flow line from acid-forming sewer gases produced by anaerobic bacteria.

SEWER UNCOVERED
The sewer line is uncovered below the flow line. Often the trench walls themselves can serve as outer form for the new concrete encasement.

T-LOCK ATTACHED
Sheets of T-Lock are attached with adhesive to the exterior of the sewer line. The sheets are made continuous by heat-fusing a weld strip over the seems.

STEEL & CONCRETE
After steel reinforcement has been placed, concrete is poured around the sewer line. The concrete flows around the projecting tees, permanently locking the sheet in place.

T-LOCK ENCASEMENT
The old sewer line is now furnished with a T-Lock lined concrete encasement. All rehabilitation work has been accomplished without interruption of service.

LONG TERM PROTECTION
The exposed pipe surfaces continue to corrode until the liner is exposed. The liner permanently protects the concrete encasement against corrosion.